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"The Vampire Vape Branded Ego C-Twist battery is an advanced, yet easy to use variable voltage battery that allows you to adjust the output voltage from 3.3V to 4.8V."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.vampirevape.co.uk/vampire-vape-branded-ego-c-twist-vv-battery-900mah.html>